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Climate changes in the pre-Hirnantian Late Ordovician based on delta O-18(phos) studies from Estonia
Mannik, Peep1; Lehnert, Oliver2,3,4; Nolvak, Jaak1; Joachimski, Michael M.2
2021-05-01
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume569Pages:16
Abstract

Results of conodont-based delta O-18(phos) studies from two core sections in Estonia (Mehikoorma-421 and Valga-10) indicate that the pre-Hirnantian Late Ordovician was characterized by a general cooling trend: a rapid climate cooling in the early Sandbian and a less intense cooling in the late Sandbian through Katian. During this time interval, sea-surface temperatures probably decreased by up to 9 degrees C. This fits with earlier ideas of a colder Late Ordovician climate before the Hirnantian. On the background of general cooling trend in the pre-Hirnantian Late Ordovician, tendencies in the temperature changes were quite variable. Several episodes of SST decrease and increase of different magnitudes and durations are evident from the delta O-18(phos) curves in the studied sections. In the interval sampled in detail, 7 cooling events are recognized and tentatively called (in stratigraphical order): Early Kukruse, Haljala, Keila, Early Nabala, Vormsi, Early Pirgu and Middle Pirgu CE-s. Duration of these events and amplitudes of changes in seawater temperatures increased from Sandbian to late Katian. All cooling events may have triggered the waxing of polar and subpolar Gondwana icecaps and are reflected in the sedimentary succession by major sea-level lowstands recognized also outside the study region. Results of our research do not support a simple, straightforward correlation between temperature trends inferred from delta O-18(phos) measurements and changes in the delta C-13 record. Comparison of delta O-18(phos) and delta C-13 curves reveal that these two variables behave quite independently: in some intervals their trends fit quite well, in others they might show completely the opposite. For this comparison we provide also a new, detailed delta C-13 curve from the Valga-10 core section.

KeywordPalaeoclimate Glaciation Oxygen and carbon isotopes Sandbian-Katian Baltoscandia
DOI10.1016/j.palaeo.2021.110347
Indexed BySCI
Language英语
Funding ProjectEstonian Research Council[PRG 836] ; Deutsche Forschungsgemeinschaft (DFG)[LE 867/8-1] ; Deutsche Forschungsgemeinschaft (DFG)[LE 867/12-1] ; Deutsche Forschungsgemeinschaft (DFG)[LE 867/8-2] ; Estonian Research Council focusing on Late Ordovician climate and sea-level changes[PUT 378]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000636767300019
Funding OrganizationEstonian Research Council ; Deutsche Forschungsgemeinschaft (DFG) ; Estonian Research Council focusing on Late Ordovician climate and sea-level changes
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38669
Collection中国科学院南京地质古生物研究所
Corresponding AuthorMannik, Peep
Affiliation1.Tallinn Univ Technol, Inst Geol, Ehitajate Tee 5, EE-19086 Tallinn, Estonia
2.Friedrich Alexander Univ Erlangen Nurnberg FAU, GeoZentrum Nordbayern, Schlossgarten 5, D-91054 Erlangen, Germany
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing, Peoples R China
4.Czech Univ Life Sci Prague, Fac Environm Sci, Prague 6, Czech Republic
Recommended Citation
GB/T 7714
Mannik, Peep,Lehnert, Oliver,Nolvak, Jaak,et al. Climate changes in the pre-Hirnantian Late Ordovician based on delta O-18(phos) studies from Estonia[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2021,569:16.
APA Mannik, Peep,Lehnert, Oliver,Nolvak, Jaak,&Joachimski, Michael M..(2021).Climate changes in the pre-Hirnantian Late Ordovician based on delta O-18(phos) studies from Estonia.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,569,16.
MLA Mannik, Peep,et al."Climate changes in the pre-Hirnantian Late Ordovician based on delta O-18(phos) studies from Estonia".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 569(2021):16.
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